There are 14 US Post Offices in Pacific County serving a total of 21,909 residents equating to 1,565 residents per post office. It's estimated that approximately 34,969 packages are handled across the 14 county post offices annually. Pacific County is a county located in the U.S. state of Washington. As of the 2010 census, the population was 20,920. Its county seat is South Bend, and its largest city is Raymond. The county was formed by the government of Oregon Territory on February 4, 1851 and is named for the Pacific Ocean. The unincorporated community of Oysterville, established in 1852, was the original county seat until the late 19th century when it changed to South Bend. Pacific County is centered on the Willapa Bay, a region that provides twenty-five percent of the United States oyster harvest, though forestry, fishing, and tourism are also important elements of the county's economy."